The heavy metal adsorption characteristics on metakaolin-based geopolymer

被引:340
作者
Cheng, T. W. [1 ]
Lee, M. L. [1 ]
Ko, M. S. [1 ]
Ueng, T. H. [1 ]
Yang, S. F. [2 ]
机构
[1] Natl Taipei Univ Technol, Inst Mineral Resources Engn, Taipei, Taiwan
[2] Inst Nucl Energy Res, Div Phys, Lung Tan, Taiwan
关键词
Metakaolin; Geopolymer; Adsorption; Heavy metals; IMMOBILIZE TOXIC METALS; FLY-ASH; POTENTIAL USE; REMOVAL; ADSORBENTS; IONS; DYE;
D O I
10.1016/j.clay.2011.11.027
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Since porous materials often function as adsorbents, this study chose to investigate the adsorption of heavy metals by geopolymers. The geopolymer was made by condensing a mixture of metakaolin and alkali solution at a fixed ratio at room temperature and then pre-crashed to a fixed-radius size. This paper examined the adsorption efficiency of the geopolymer for different heavy metals (i.e., Pb2+, Cu2+, Cr3+, and Cd2+) in aqueous solutions under discrete experimental parameters. The experimental results verified that the geopolymer could adsorb heavy metals. Of the metals tested, optimal adsorption with the implementation of the geopolymer occurred with Pb2+. The data fit both the pseudo-second-order and the Langmuir equations. This discovery may facilitate the development of optimized procedures for wastewater treatment, thus providing an alternative solution to environmental damages caused by heavy metal pollutants. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:90 / 96
页数:7
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